TM 5-2420-231-23-1
0073
Table 1. Multiple Backhoe Operations (Pilot Controls) Do Not Function Correctly - Continued.
073
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. Connect batteries (WP 0157) and
Multiple Backhoe
turn ignition switch to the on posi-
Operations (Pilot Controls)
tion (TM 5-2420-231-10).
Do Not Function Correctly -
Continued
NOTE
Ensure control pattern switch is in pattern 1 position.
4. Turn pilot control switch to on posi-
tion (TM 5-2420-231-10).
5. Using a digital multimeter, mea-
Voltage 10 to 14 Volts - Proceed to
sure voltage between pilot control
Test Step 28.
wiring harness connector (WP
Voltage Less Than 10 Volts - Replace
0007, Figure 193) terminals 1 and
pilot controls wiring harness (WP 0187).
2. Voltage should be 10 to 14 volts.
Proceed to Test Step 28.
Test Step 28. Test for Faulty
Pressure Reducing Valve Solenoid.
1. Turn ignition switch to the off posi-
tion (TM 5-2420-231-10) and dis-
connect batteries (WP 0157).
2. Disconnect pilot control wiring har-
ness connector (WP 0007, Figure
188) from pressure reducing valve
solenoid (WP 0007, Figure 195).
3. Connect batteries (WP 0157) and
turn ignition switch to the on posi-
tion (TM 5-2420-231-10).
4. Turn pilot control switch to on posi-
tion (TM 5-2420-231-10).
5. Using a digital multimeter, mea-
Voltage 10 to 14 Volts - Replace pilot
sure voltage between pilot control
control valve assembly (WP 0264).
wiring harness connector (WP
Proceed to Test Step 29.
0007, Figure 188) terminals 1 and
Voltage Less Than 10 Volts - Replace
2. Voltage should be 10 to 14 volts.
pilot controls wiring harness (WP 0187).
Proceed to Test Step 29.
Test Step 29. Verify That Symptom Is
Resolved.
1. Ensure all wiring harness connec-
tors are reconnected.
2. Connect batteries (WP 0157) and
turn ignition switch to the on posi-
tion (TM 5-2420-231-10).
3. Start and operate the machine
(TM 5-2420-231-10).
4. Turn pilot control switch to on posi- Pilot Control Switch Illuminates -
tion (TM 5-2420-231-10).
Proceed to step 5.
Pilot Control Switch Does Not
Illuminate - Repeat troubleshooting
from the beginning.
0073-14